I turn the key two clicks, the pulgs light up and the electronics (radio, lights etc) all work. Turn the third click to start and nothing happens. The radio drops out as explected, but the starter motor does not come in.

So far I have tested the live feed to the motor/solenoid, that's a healthy 12.4v, starter relay (on interior fuseboard) which operates correctly, and replaced the starter motor/solenoid assembly with a new one.

Any ideas what else could be stopping it?

Any help would be very much appreciated

Thanks in advance...